It will only work if you create a custom aupreset which responds to aftertouch 
in some specific way.  The GM specification has no defaults for these events.

-DS

On Oct 10, 2014, at 12:30 AM, tin <[email protected]> wrote:

> Hi all,
> 
> I’m  trying to use  MusicDeviceMIDIEvent to send  after-touch message (or 
> named poly-pressure , 0xA..) to a synth audioUnit.  in my Mac app.
> 
> it seems doesn’t  works.     is it unsupported  in CoreMIDI or  AUSampler ?
> 
> 
> Thanks
> Tin
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